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【单选题】
He has been able to release the sun"s heat that is trapped in things such as wood, coal and oil. From this sentence we know （）.A.
man can get heat from things like wood, coal and oil
B.
man can not get the heat directly from the sun
C.
only wood, coal and oil have heat
D.
all the sun"s heat is trapped in things
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【单选题】The electronic digital governor is virtually maintenance free. There are no moving parts to wear and the accuracy attainable is far ______ the mechanical governor.
A.
superior to
B.
inferior to
C.
superior than
D.
inferior than
【单选题】在Word 中,拆分单元格指的是_____。
A.
对表格中选取的单元格按行列进行拆分
B.
将表格从某两列之间分为左右两个表格
C.
从表格的中间把原来的表格分为两个表格
D.
将表格中指定的一个区域单独保存为另一个表格
【单选题】下列有关信号的说法错误的是( )
A.
信号是消息的表现形式
B.
声音和图像都是信号
C.
信号都可以用一个确定的时间函数来描述
D.
信号可以分解为周期信号和非周期信号
【简答题】There are many items that need to be guaranteed for steel. The five guarantee indexes for the mechanical properties of steel refer to , , , and .
【判断题】There are two main types: mechanical and hydraulic presses. 这句话的意思是主要有两种类型：机械压力机和液压机。
A.
正确
B.
错误
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