在电路中,若两个或两个以上的电阻按顺序一个接一个地连成一串,使电流只有一条通路的连接方式称为电阻的()。
参考答案:串联
影响矽肺发病的重要因素有很多,以下哪项除外()
A.粉尘中游离二氧化硅类型
B.二氧化硅含量
C.粉尘浓度
D.劳动者心情
E.接尘时间
. --- What’s the matter with Jason? He looks a bit upset.
--- Didn’t you know? When returning from his holiday last night, he found his house _____.
A.broken in
B.broken into
C.broken out
D.broken down