________ were brought back to ship from the sea
A. The crew
B. The crew member
C. A person
D. The members
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Where are the derricks？ They are ________
A. in deck
B. on deck
C. at deck
D. below deck
Dry powder is used to put out ________
A. electrical fire
B. oil fire
C. common fires
D. all kinds of fires
What ________ the safe working load of the derrick？
A. is
B. be
C. are
D. has
有关动脉导管未闭的手术治疗方法，下列不正确的是
A. 单纯结扎术(双重结扎+缝扎)，适用于管型的未闭动脉导管
B. 导管前壁加垫结扎术，适用于伴严重肺动脉高压者
C. 切断缝合术，操作较复杂，有大出血之虞
D. 漏斗型未闭动脉导管，可用放射介入治疗
E. 动脉瘤型未闭动脉导管，可用夹闭术
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