在轮胎充气活门上安装轮胎充气适配头和压力表。 A: Install the tire inflating valve and pressure gauge upstream of the tire inflating adapter. B: The tire inflation valve and pressure gauge are respectively installed at both ends of the tire inflation adapter head. C: Installthe tire inflation adaptor and pressure gage on the tire inflation valve.

The number of adults smokers may be _________, but smokers between the ages of 13 and 23 have actually increased by 10 percent over the last 10 years. A: Condensing B: Inflating C: Shrinking D: Shortening

At the beginning of the year, Tom's Tubes had a capital stock of 5 tube inflating machines. During the year, Tom scrapped 2 old machines and purchased 3 new machines. Tom's capital stock at the end of year equals (在年初，汤姆的管子拥有5台管式充气机的资本。年内，汤姆报废了两台旧机，购买了3台新机。汤姆在年底的股本等于——中文由在线翻译而来，仅供参考) A: 1 machine.1机。 B: 2 machines.2台机器。 C: 3 machines.3台机器。 D: 6 machines.6台机器。