单项选择题

高层建筑地下室的耐火等级应为：( )

A.一级
B.不应低于二级
C.一类高层建筑应为一级，二类高层建筑应为二级
D.建筑物高度50m以上者应为一级，建筑高度50m以下者应为二级

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They all looked so happy. They_________have succeeded a...

单项选择题They all looked so happy. They_________have succeeded after so many failures.

A.must
B.would
C.should
D.could

患者男性，62岁，因食管癌预进行食管下段切除吻合术，术前给予病人下胃管，那么鼻管插入的长度应为( )A．10～...

单项选择题患者男性，62岁，因食管癌预进行食管下段切除吻合术，术前给予病人下胃管，那么鼻管插入的长度应为( )

A．10～24cm
B．25～34cm
C．35～44cm
D．45～55cm
E．56～65cm

选做题- Exercise: Decide whether the following sentences a...

判断题选做题- Exercise: Decide whether the following sentences are correct parallel structures or not.
Jane is pretty, with brown hair, and has a graceful manner.