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【单选题】
平面任意力系平衡的必要和充分条件也可以用三力矩式平衡方程 ΣMA(F)=0,ΣMB(F)=0,ΣMc(F)=0表示, 欲使这组方程是平面任意力系的平衡条件,其附加条件为( )A.
投影轴X轴不垂直于A、B或C。
B.
投影轴Y轴不垂直于A、B或B、C。
C.
投影轴X轴垂直于y轴。
D.
A、B、C三点不在同一直线上。
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【单选题】Why did Abubakar take pictures of children?
A.
She wanted to show they are in cruel conditions.
B.
She wanted to show they are happy despite their sufferings.
C.
She wanted to show they are different from the old.
D.
She wanted to show they are victims of war.
【简答题】按保价运输的行李、包裹核收 。行李保价费按声明价格的 计算,包裹保价费按声明价格的 计算。
【简答题】《煤矿安全规程》规定采掘工作面进风流中CO2的浓度不得超过( )% 。 A 0.5 B 0.75 C 1.0
【单选题】Why did most people spend less time on their hobbies in early years?
A.
Because they were not interested in hobbies.
B.
Because there were not any activities for them to take part in.
C.
Because they were busy making a living.
D.
Because they were healthy.
【简答题】按保价运输的行李、包裹核收保价费。行李保价费按声明价格的（）、包裹保价费按声明价格的（）计算。
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