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【单选题】
当遭遇海盗袭击时，全体船员应立即按防海盗应急部署 ____ 。A.
撤退至安全舱室
B.
到指定地点集台
C.
做好弃船准备
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皮皮学刷刷变学霸
举一反三
【多选题】There is one or more irrelevant sentences in each paragraph that follows. The Japanese automobile industry uses robots in many stages of its production process. In fact, one large Japanese auto factor...
A.
Some Japanese universities are developing medical robots to detect certain kinds of cancer.
B.
Another automobile factory in Japan uses them to paint cars as they come off the assembly line.
C.
It is of great efficiency and very-welcomed by company managers so they apply more robots in their factories.
D.
More employers are fired because of the intensive use of robots in this industry.
【简答题】醛的官能团是 ,酮的官能团是 。