采用拖放的方式将一个文件从当前位置复制到另一个逻辑硬盘的文件夹中，（）。 ["A.必须按住Ctrl键用鼠标左键拖放","B.必须按住Shift键用鼠标左键拖放","C.必须按住Alt键用鼠标右键拖放","D.不用按住键盘键直接用鼠标左键拖放"]
If your vessel were proceeding down river (descending)，a green square marker with a green reflector border on the right bank would be a（）. ["mile board","dredging mark","passing daymark","crossing daymark"]
“艺术起源于劳动”理论的有力提倡者是（）。 ["马克思","恩格斯","列宁","普列汉诺夫"]
长丝酸样偏离中心值（）以上会造成纺丝隔离。 ["3g\/l","4g\/l","2g\/l"]
交谈时，表情要自然、得体，目光应含笑，注视（） ["前方","对方","上方","下方"]
什么是其他货船？
