马群基地有()架高柱信号机。
A. 2
B. 3
C. 4
D. 5
Which statement about firefighting foam is TRUE?()
A. Foam conducts electricity
B. To be most effective,foam should be directed at the base of the fire
C. Foam is most effective on burning liquids which are flowing
D. Foam can ONLY be used to extinguish class A fire
自()起,将电信业纳入营业税改征增值税试点范围。
A. 2014年6月1日
B. 2015年9月1日
C. 2014年9月1日
D. 2015年6月1日
The ancient Egyptians believed all illnesses were related to()was eaten.
A. which
B. it
C. what
D. that