建设项目竣工环境保护验收时,固体废物监测对可以得到标准样品或质量控制样品的项目,应分析的同时做( )的质控样品分析。
A.5% B.10%C.15% D.20%
参考答案:B
— Has Linda come back from Canada?
— Yes. She ______ there for eight years.[ ]
A. has stayed
B. stays
C. stayed
D. had stayed
在诊断点火系故障时,若取下缺火缸高压线,把线头放在离火花塞接线柱3~4mm处,起动发动机,若间隙处有火花且运转不均匀的现象减弱或消失,表明()。