问题
选择题
A lot of questions _________ at the meeting, which made things more complicated(复杂的). [ ]
A. came across
B. came up with
C. came up
D. came in
答案
答案：C
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A lot of questions _________ at the meeting, which made things more complicated(复杂的). [ ]
A. came across
B. came up with
C. came up
D. came in
答案：C
N，再用一绳系OC绳的A点，BA绳能承受的最大拉力为30 N，现用水平力拉BA，可以把OA绳拉到与竖直方向成多大角度?