收起落架，舱门已关闭锁好，说法正确的是（）
A.取消起落架的信号
B.起落架选择活门断电
C.起落架收上管路要释压
D.以上都对
参考答案：D
I shall never forget the day _____ Shenzhou Ⅵ was launched, _____ has a great effect on my life. [ ]
A. when; which
B. that; which
C. which; that
D. when; that
围生期是指（）
A.从孕期满27周至生后7天
B.从孕期满37周至生后7天
C.从孕期满28周至生后7天
D.从孕期满28周至生后1个月
E.从孕期满37周至生后1个月
