Windows状态下的MS-DOS方式是虚拟的DOS环境,在虚拟的MS-DOS环境提示符下键入()命令可返回到Windows。
A. DOWN
B. EXIT
C. BACKSPACE
D. ENTER
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An overtaking situation would be one in which one vessel is approaching another from more than how many degrees abaft the beam? ()
A. 0°
B. 10°
C. 22.5°
D. None of the above
起重用钢丝绳的接头,必须采用插接,其插接长度不得小于钢丝绳直径的20倍,总长度不得短于()。
A. 150mm
B. 200mm
C. 250mm
D. 300mm
环烷烃热裂解的产物可以是(),也可以是烯烃。
A. 烷烃
B. 环烷烃
C. 氢气
D. 芳烃