初冷器内通入冷却水时，应先打开入口阀门，再打开出口阀门。
参考答案：错
The team, ______ to climb the world’s second tallest mountain twice, finally decided to give up.
A．having attempted
B．attempting
C．attempted
D．to attempt
每次接通起动机的时间不得超过5s。
