如果结果不匹配，请 
更多“上芯作业员添加LF前我们已经核对了LF及其方向，所以加完LF…”相关的问题
第3题
如图所示，由两个透镜组成的合成系统，现要求其合成焦距f'=100mm，lF=－50mm，lF'=50mm，试求f1'，f2'以及二透
如图所示，由两个透镜组成的合成系统，现要求其合成焦距f'=100mm，lF=-50mm，lF'=50mm，试求f1'，f2'以及二透镜间隔d值。
第5题
lf headaches only occur at night, lack of fresh air is often the causeA.start B.b
lf headaches only occur at night, lack of fresh air is often the cause
A.start
B.begin
C.happen
D.visit
第7题
lf you want to have a healthy body. you have to spend nlom dnle withA．your teachersB．your
lf you want to have a healthy body. you have to spend nlom dnle with
A．your teachers
B．your children
C．your worker
第8题
It is ______ bad for yours lf ______ for our daughter and me.A．both...and...B．not only...b
It is ______ bad for yours lf ______ for our daughter and me.
A．both...and...
B．not only...but also...
C．as...as...
第9题
lf many older physicians stop working in the coming years，Americans will have. A．e
lf many older physicians stop working in the coming years，Americans will have.
A．even less access to medical services.
B．even better patient care.
C．a shortage of younger physicians.
D．more job opportunities.
