3000米以下的涡轮喷气航空器，距接地点的距离超过35千米，最低调整表速为（）千米/小时。
A.470
B.400
C.310
D.280
参考答案：B
___in the regulations that one should not tell other people the password of your email account.
A．What is recommended
B．What recommend
C．It is recommended
D．It recommend
弯管机在工作中，要经常注意各部位的运转情况，如有异常现象，应立即停机，（）
