配制硫酸阿托品注射液时通常要调pH=3.5~4.0，并需用流通蒸气灭菌30分钟，这是因为本品易被 A.
氧化 B.
还原 C.
水解 D.
脱水 E.
聚合

钢绞线应力松弛性能试验允许至少用（ ）的测试数据推算1000h的松弛率值。A.10hB.24hC.48hD...

单项选择题钢绞线应力松弛性能试验允许至少用（ ）的测试数据推算1000h的松弛率值。

When he came to, he found himself ______ on a chair, wi...

单项选择题When he came to, he found himself ______ on a chair, with his hands ______ back.
A.to sit/tying
B.sitting/tying
C.seating/tied
D.seated/tied

某预应力混凝土构件中,预应力钢筋初始应力为317MPa,一段时间后测得钢筋的应力为308MPa,则该预应力钢筋...

单项选择题某预应力混凝土构件中,预应力钢筋初始应力为317MPa,一段时间后测得钢筋的应力为308MPa,则该预应力钢筋的应力松弛率为（ ）%。