某轮漂流,船上相对计程仪改正率△L=0%,海区内有流,流速2kn,1h后计程航程为()
A、0′.0
B、+2′.0
C、-2′.0
D、视海区内风、流方向而定
参考答案:A
从某一高度处水平抛出一物体,它着地时速度是50m/s,方向与水平方向成53°,取g=10m/s2,求:
(1)抛出点的高度和水平射程;
(2)抛出后3s末的速度.
The little girl couldn’t ________ the problem. She wasn’t ________ clever.
A.get through, very
B.make out, much
C.work out, that
D.get across, so