用户引入管进入密闭室内空间时，密闭室必须改造，设置换气口，且通风换气次数每小时不得小于（）次。
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家庭教育要树立以人为本的发展观，强化人文关怀，注重孩子的可持续发展，杜绝“分数至上”的狭隘发展观。
A. 正确
B. 错误
好的或有益的企业文化就是（）的企业文化氛围。
A. 严肃等级型
B. 自由宽松型
C. 宽松等级型
D. 灵活多样型
Which step should be taken，if possible，when the vessel must be abandoned because of a distress situation（）.
Alert the Coast Guard by using the survival craft's portable INMARSAT unit
B. Program the SART and EPIRB to transmit the vessel's location and situation
C. Place the SART and EPIRB in the“ON”position and secure them to the survival craft
D. No additional steps are needed as the SART and EPIRB will both automatically float free and operate properly
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