逆螺旋试验与螺旋试验相比较,其缺点是:()
Ⅰ、需时较多Ⅱ、容易进行Ⅲ、结果不够准确Ⅳ、需要角速度陀螺仪
A.Ⅰ、Ⅱ、Ⅲ、Ⅳ
B.Ⅱ、Ⅲ、Ⅳ
C.Ⅲ、Ⅳ
D.Ⅳ
参考答案:D
—There are five people in the room, but I know _____.
—It doesn’t matter. I’ll introduce(介绍) them to you .
A. both of them B. none of them C. neither of them
扑救森林火灾遇险时,正确的脱险自救方法有()。
A.退入安全区
B.按规范点火自救
C.按规范俯卧避险
D.按规范迎风突围