激光辐射窗口标志为带说明文字的长方形。激光产品辐射分类说明标志为带说明文字的正方形。()
参考答案:错
----- I am certain David has told you his business troubles.
----- ______, it is no secret that he owes a lot of money to the bank.
A.Therefore
B.However
C.Anyway
D.Though
校配无框眼镜时,顾客的眼睛与耳朵距离较长,会造成镜架镜腿弯点长(),应调整(),直至合适。
A、过短;将镜腿弯点长增大
B、过长;将镜腿弯点长减小
C、过长;将镜腿弯点长增大
D、过短;将镜腿弯点长减小