中国大学MOOC: How to inform the passenger of the delay in case of air traffic control?

In the case of __________, charterer obtains possession and full control of the vessel along with the legal and financial responsibility for it.

Which of the following descriptions is wrong about the control of an air conditioner?_____ A: The control position can be divided into remote control and local control. B: In local control, the automatic control system also needs to work. C: If the remote control doesn't work, the air conditioner won't work. D: In case of control system failure, manual control mode can be adopted.

以下描述属于case-control study方法的是：

The investigation direction of case-control studies is from exposure to outcome, prospectively.

In case of poisoning, immediately give large quantities of soapy or salty water in order to （）vomitting. A: control B: clean C: induce D: stop

​How to inform the passenger of the delay in case of air traffic control?‎ A: We are waiting for air traffic control clearance. B: The plane will be taking off soon. C: We are sorry to inform you that we will be delayed. D: Please remain seated.

How to inform the passenger of the delay in case of air traffic control? A: We are waiting for air traffic control clearance. B: The plane will be taking off soon. C: We are sorry to inform you that we will be delayed. D: Please remain seated.

It also allows instrument approaches to be made procedurally at airports where air traffic control does not use ____or in the case of ____ failure. A: radio B: communication C: electricity D: radar

case-control study设计中病例的选择，以下表述正确的有哪些？