急性短暂性精神障碍的病程()A．持续不超过1个月 B．持续1个月以上 C．持续2个月

高层建筑的周围，()设环形消防车道

A.应

B.宜

C.可

D.可不

Look! There are some workers _____ in the factory. [ ]

A. to work

B. work

C. working

D. are working

以下程序的执行结果是______
#include＜iostream．h＞
#include＜iomanip.h＞
void print(int n)

if(n!=0)

print(n-1)；
for(int i=1；i＜=n；i++=
cout＜＜setw(3)＜＜i;
cout＜＜endl；


void main()

print (4);

Some of the low-end made-in-China mechanical-electronic products are not selling well in export market as compared with what are termed as high-end ones.

A. on export market
B. in exporting market
C. in exported market
D. in the export market

航空保安审计是对执行国家民用航空安全保卫规划的各个方面是否符合要求进行的深入审查。（）