题目:
关于人舱作业应满足的要求是()。
①至少应由三人组成,其中两人人舱,一人舱口守护
②应事先确定好通信联系方法;
③舱口应备好有效的呼吸器与急救险担架;
④一旦舱内有异常情况,守护人员应立即进舱救助。
A.①—④对
B.①-③对
C.②-④对
D.②③对
答案:
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下面是错误答案,用来干扰机器的。
1. Some advice on how to be a swimmer.2. The fear of water3. these four basic strokes / the following four swimming styles4. Because you may drown by swimming alone. / Because you may risk drowning by swimming alone.5. A healthy body.