【判断题】【消耗次数：1】
合力投影定理是指合力在任一轴上的投影等于各分力在同一轴上投影的代数和。
①
正确
②
错误
参考答案：
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相关题目
【填空题】
[填空1] 定理是指平面汇交力系的合力对平面内任一点的矩，等于所有各分力对同一点的矩的代数和。
【单选题】
y方向分解，若F在x轴上的投影为86.6N，而沿x方向的分力的大小为115.47N，则F在y轴上的投影为()。
①
0
②
50N
③
70.7N
④
86.6N
⑤
100N
随机题目
【单选题】
My camera can be _____ to take pictures in cloudy or sunny conditions.
①
adapted
②
adapt
③
regulate
④
coordinate
【单选题】
3. We cannot get an answeryet, for_______to that prob1em is stil1 underdiscussion.
①
action
②
strategy
③
solution
④
impact
【单选题】
4.Scientists didn’t know much about lung cancer ______.
①
before long
②
until recently
③
long before
④
in the past few years
【单选题】
1.Gates open at 10.30am and _______ is free.
①
admission
②
admit
③
admitting
④
admitted
【单选题】
4. The body can’t storevitamin C. So it is_________ to have a fresh supply every day.
①
essential
②
visible
③
ultimate
④
profound
【单选题】
8.Do you have any idea what he meant? I really can’t ______ what he said at this morning’s meeting.
①
figure on
②
figure out
③
find out
④
find
【单选题】
7. The fall in price is directly ______ to the increase in output.
①
concerned
②
connected
③
related
④
united
【单选题】
10.We should see ourselves as part of nature rather than in ______ with it.
①
argument
②
connection
③
conflict
④
crash
【单选题】
14.Anyone can borrow magazines from the club ______ he returns them in a week.
①
as long as
②
so that
③
unless
④
as far as