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【多选题】
关于曲柄连杆机构的叙述,下列说法正确的是()。A.
直接与高温高压气体接触
B.
曲轴的旋转速度很高
C.
活塞往复运动的线速度相当大
D.
受到化学腐蚀作用
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举一反三
【单选题】In my opinion, life in the twentyfirst century is much easier than ________. [ ]
A.
those used to be
B.
it is used to
C.
it was used to
D.
it used to be
【单选题】下列是关于字符数组的描述,错误的是( )。
A.
字符数组可以存放字符串
B.
字符数组中的字符串可以整体输入输出
C.
可以用关系运算符对字符数组中的字符串进行比较
D.
定义字符数组时，可以使用一个字符串对其初始化
【单选题】Nothing in my life has meant ____ to me as his praise. [ ]
A.
as much
B.
more
C.
that much
D.
as good
【单选题】In my opinion, life in the twentyfirst century is much easier than . [ ]
A.
that used to be
B.
it is used to
C.
it was used to
D.
it used to be
【单选题】In the last paragraph, by saying 'I would like to lunatic-proof my life as much as possible', one of the researchers interviewed by Joanna Kempner is suggesting that______.
A.
the personal life of the researchers might also be affected by their research.
B.
he doesn't want his life to be affected by the people who are mad.
C.
he would like the policeman to protect his life.
D.
his life is always in danger.
【简答题】如图，从圆O外一点A引圆的切线AD和割线ABC，已知AD=2 3 ，AC=6，圆O的半径为3，则圆心O到AC的距离为______．
【单选题】下列是关于字符数组的描述,错误的是 ________ 。
A.
字符数组可以存放字符串
B.
字符数组中的字符串可以整体输入输出
C.
定义字符数组时，可以使用一个字符串对其初始化
D.
可以用关系运算符对字符数组中的字符串进行比较
【简答题】如图，从圆O外一点A引圆的切线AD和割线ABC，已知 AD=4 2 ，圆O的半径r=AB=4，则圆心O到AC的距离为______．
【单选题】下列关于字符数组的描述中，错误的是。
A.
一维字符数组可以存放一个字符串
B.
二维字符数组可以存放多个字符串
C.
可以使用一个字符串给二维字符数组赋值
D.
可以用一个字符串给二维字符数组初始化
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