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【单选题】
如图所示,一个物体静止在斜面上,受到重力G、斜面对它的支持力F与摩擦力f作用,根据二力平衡条件的知识判断,支持力F与重力G的合力方向是( )A.
竖直向上，与重力G方向相反
B.
垂直于斜面向下，与支持力F方向相反
C.
平行于斜面向下，与摩擦力f方向相反
D.
水平向右，与重力G方向垂直
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【简答题】简述核苷酸的主要生物学作用。
【单选题】Hanging a barge off means to ______.
A.
moor a damaged barge to the bank and leave
B.
remove and deliver a loaded barge from a multiple tow
C.
remove a barge while locking through
D.
tow an empty barge astern
【单选题】What does "exceed" mean?
A.
say publicly or officially that sth. important is true or exists
B.
be more than a particular number or amount
C.
make small changes to an engine so that it works as well as possible
D.
make sth. that is spoken or written shorter
【简答题】下面这个Sub过程的功能是统计字符串中“a”的个数，请在空白处填上合适的代码完成程序。 Private Sub numCount() Dim hum As Integer s＄ = 'software And hardware' num = Len(s$) For i = 1 To hum b$=______ If b$ = 'a' Then x = x+1 Next i Print 'x='; ...
【单选题】The number or name of a tank barge shall be（）.
A.
displayed in at least 4 different positions on the barge
B.
carved on a wooden board and attached to the barge's hull
C.
displayed as close to the navigation lights as possible
D.
displayed at the highest point of the barge's hull such that it can be seen from either side
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