搁置或停运六个月以上的变压器，投运前应做（）试验。 A.绝缘电阻 B.绝缘电阻和绝缘

M: The taxi driver must have been speeding.
W: Well, not really. He crashed into the tree because he was trying not to hit a box that had fallen off the truck ahead of him.
Question: What do we learn about the taxi driver().

A. He turned suddenly and ran into a tree.

B. He was hit by a fallen box from a truck.

C. He drove too fast and crashed into a truck.

D. He was trying to overtake the truck ahead of him.

以下程序的正确运行结果是( )。
#include＜iostream.h＞
hat fun(int);
void main()

int a=2,i;
for(i=0;i＜3;i++)
cout＜＜fun(a)＜＜end1;
cout＜＜end1;

int fun(int a)

int b=0;
static int c=3;
b++;c++;
return(a+b+c);

A) 4, 5, 6
B) 6, 7, 9
C) 7, 8, 9
D) 7, 7, 7

论述半纤维素对溶解浆的影响。

请选择“可能”“不可能”“一定”填在括号里．

（1）太阳从东方升起．______ （2）鸟在水中游．______ （3）冬天下雪．______．

在一定温度下的饱和食盐水里加入少量的硝酸钾晶体，则（　　）

①硝酸钾晶体不溶，②硝酸钾晶体溶解，③溶液中食盐的质量分数不变，④溶液中食盐的质量分数减小，⑤溶液中食盐的质量分数增大．

A．①③

B．②③

C．②④

D．②⑤