测量发动机进气管真空度的仪器是（）。
A.真空表
B.发动机综合测试仪
C.QLY——1型汽缸漏气量检测仪
D.千分表
参考答案：A
Mr. Chapman retired at 70 after he _____ nearly 40 years with the Gas Company. [ ]
A. had spent
B. has spent
C. spends
D. would spend
光面爆破后围岩壁面成型规则，凹凸很小，大大减少了（）。
A、支护
B、衬砌
C、超欠挖量
D、量测
