A “fifteen-pound” CO2 extinguisher is so called because（）.
A: there are fifteen pounds of CO2 in the container
B: the container，when full，weighs fifteen pounds
C: the pressure at the discharge nozzle is l5 psi
D: the empty container weighs fifteen pounds
A: there are fifteen pounds of CO2 in the container
B: the container，when full，weighs fifteen pounds
C: the pressure at the discharge nozzle is l5 psi
D: the empty container weighs fifteen pounds
举一反三
- (单选)<br/>When did Baidu's unmanned vehicle appeared in public for the first<br/>time?(). A: December<br/>thirteen, twenty fifteen B: December<br/>fourteen, twenty fifteen C: December<br/>fifteen, twenty fifteen D: December<br/>sixteen, twenty fifteen
- Besides them, we need _____ to do the work. A: fifteen people more B: more fifteen people C: fifteen more people
- 【单选题】Walking briskly for thirty minutes will burn as many calories as__________. A. to run for fifteen minutes B. running for fifteen minutes C. you run for fifteen minutes D. fifteen minutes walking
- The petrol station lies within （）of Victoria’s farm. A: fifteen-minute-drive B: fifteen minutes’ drive C: fifteen minute’s drive D: fifteen minutes drive
- The ________ runner can run 2 miles in fifteen minutes.