In the course of fracturing construction,stand or fall of fracturing fluid has become the key factor of construction measure.

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Leaves crowded near apex of the trunk, spirally arranged; stipes dark brown, with sharp spines; lamina large, oblong, tripinnate; pinnae 17-20 pairs, alternate, longest one to 60 cm long, the basal one reduced; rachis short-spiny; pinnules 18-20 pairs, sessile or nearly so, lanceolate, to 10 cm long and 2.5 cm wide, divided almost to the costa; segments more or less falcate, toothed.

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Leaves alternate; stipule sessile, usually ciliate, persistent; leaf blade palmately lobed or sometimes deeply dissected.

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Leaves rosette, orbicular to oblanceolate or linear, 0.5-1.2 cm long, 2-4 mm wide, with glandular hairs; stipule membranous, light red, 5 mm, deeply 3-parted, middle lobe larger, 2- or 3-lobed at apex; petiole flattened, 1-3.2 cm long, glandular or glabrous.

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The STOA and LTOA experiments were used to simulate the aging of asphalt mixtures in different using periods,and the low temperature anti-cracking property was evaluated with the indices of utmost strain and strain energy density by low temperature bend experiment .

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And he said: Your pain is the breaking of the shell that encloses your understanding. Even as the stone of the fruit must break, that its heart stand in the sun, so must you know pain.

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Leaf blades suborbicular, 3–5-veined, base rounded to subcordate, rarely cuneate, margin with a few crenate teeth above middle, apex usually 3-lobed.

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Stigmas 2, equal, suborbicular, undivided, or 1, terminal, disclike, undivided.

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Basal petioles 10–20 cm; blade broad-triangular, 10–15 cm, ternate-2-pinnate; pinnae petiolulate; petiolules 3–6 cm; ultimate segments subovate, 3–11 × 2–6 cm, undivided or 2–3-lobed, both surfaces slightly roughened, sharply serrate or doubly serrate.

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Fruit indehiscent, samaroid silicles, transversely oblong or ovoid, 1-seeded, thin walled, with woody and coarsely reticulate venation, angustiseptate, sessile, transversely 2-winged, 2-16-spined; wings prominent, longer or shorter than main part of fruit, with 3-20 subparallel veins extending full length; spines often unequal in length, at least some subparallel to pedicel, those on the seed-bearing fruit half longer; replum and valves margin united into a longitudinal vein; septum complete; style absent, obsolete, or conical and to 5 mm; stigma capitate, entire, long papillate.

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