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【单选题】
计算机系统结构不包括( )。
A.
计算机工作状态
B.
数据表示
C.
主存速度
D.
信息保护
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【单选题】用拼音输汉字时,字母“ü”要用英文字母( )代替
A.
U
B.
W
C.
I
D.
V
【单选题】Although he has lived with us for years, he _______ us much impression.
A.
hadn’t left
B.
didn’t leave
C.
doesn’t leave
D.
hasn’t left
【单选题】Although he has lived with us for years, he ______ us much impression.
A.
hadn’t left
B.
didn’t leave
C.
doesn’t leave
D.
hasn’t left
【单选题】用Windows进行文字输入时,需进行全角/半角切换,则按____。
A.
+空格
B.
+
C.
+空格
D.
+空格
【判断题】进行片中差异时,从已经称定总重量的20丸供试品中,依次用镊子取出1丸,分别精密称定重量,得各丸重量。
A.
正确
B.
错误
【单选题】A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an _____.
A.
double-acting engine
B.
opposed pistons engine
C.
single-acting engine
D.
horizontal acting engine
【单选题】Pistons for modern engines are made of _______.
A.
cast iron
B.
steel
C.
aluminum-alloy
D.
tin-alloy
【单选题】( )信号的电平是连续变化的。
A.
数字
B.
模拟
C.
脉冲
D.
二进制
【单选题】( )信号的电平是连续变化的。
A.
数字
B.
模拟
C.
脉冲
D.
比特流
【单选题】An advantage of aluminum pistons, when compared to cast iron pistons is _____.
A.
greater high temperature strength
B.
better heat conductivity
C.
greater weight per cubic inch
D.
increased resistance to wear
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