结核菌吸入人体后发生变态反应的时间是()
A.1周
B.2周
C.3周
D.4~8周
E.9~12周
参考答案:D
当环境温度低于,使用水或清洗剂清洗发动机时,应按规定加入适量的防冻液。()
A.0℃
B.5℃
C.10℃
D.-5℃
All information reported to or likewise obtained by the commission is considered confidential.
A.in a similar way
B.in another way
C.in a direct way
D.in an unauthorized way