A . Only when there is a chance of their being seen by rescue vessels
B . At half-hour intervals
C . At one-hour intervals
D . Immediately upon abandoning the vessel
[单选题]When changing lanes, a driver should use his turning signal to let other drivers know_____ .A. he is entering which laneB. which lane he is enteringC. is he entering which laneD. which lane is he entering
[主观题]When you're _t_________ ,you should have some water.
[单选题]When comparing a firm that uses LIFO inventory accounting to firms that use
[单选题]If you do not use your arms or your legs for some time, they will become we
[单选题]If you do not use your arms or your legs for some time, they will become we
[单选题]If you do not use your arms or your legs for some time, they will become we
[单选题]If you do not use your arms or your legs for some time, they will become we
[单选题]If you do not use your arms or your legs for some time, they will become we
[单选题]You should work for __________ if you become an editor of the magazine.A. just nine hours a dayB. no less than nine hours a day C. about ten hours a dayD. less than 25 hours a week
[单选题]_____you may have, you should gather your courage to face the challenge.A. However a serious problemB. What a serious problemC. However serious a problemD. What serious a problem