导游人员在导游活动中无故不随团活动的,扣除4分
参考答案:对
They discussed ________ they could settle the problem without others' help.
A.if
B.that
C.what
D.whether
工业机器人运动自由度数,一般()
A.小于2个
B.小于3个
C.小于6个
D.大于6个