问卷中常用的答案格式有()
A.填空式
B.二项选择式
C.多项选择式
D.图表式和排序式
E.以上都是
参考答案:E
A.mgtgθ
B.mgsinθ
C.μmg
D.μmg
()has 3 specific points: fixed port, fixed line and announcing shipping time in advance.
A.liner transport
B.line ship
C.line container
D.line