高空、舷外作业时,系保险绳结应系:()。
A.丁香结
B.单套结
C.鲁班结
D.大绳接结
参考答案:B
It is required that each of the students chosen _____ good preparations ahead of time.
A.has to make
B.will make
C.should make
D.must make
慢性支气管炎与肺癌的主要鉴别依据是()。
A.发热
B.咳嗽
C.咯血
D.肺部啰音
E.痰液检查