在Windows中，为了实现中文输入法与英文输入法的切换，可按的键是（）。
A. Shift+空格
B. Shift+Ctrl
Ctrl+Alt
D. Ctrl+空格
大于（）的重型灯具、电扇及其他重型设备严禁安装在吊顶工程的龙骨上。
A. 1kg
B. 2kg
C. 3kg
D. 4kg
A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights（）.
A. do not interfere with the keeping of a proper look-out
B. are not the color of either sidelight
C. have a lesser range than the prescribed lights
D. All of the above
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