Linda doesn't know __________about her problems.
A:who to talk
B:where to talk to
C:who to talk to
D:how to talk to
某公司在组织职员体检时,发现有四名职员分别患有肺结核、糖尿病、色盲、甲型肝炎等疾病,那么与他们共同工作、生活的人可能被传染的一组疾病是( )
如图所示电路中,R1为定值电阻,R2为可变电阻,E为电源电动势,r为电源内阻.则以下说法中正确的是( )
下列选项哪个是正确的( )
“工程菌”是指 ( )