数字式万用表一般都是采用（）显示器。
A、LED数码
B、荧光数码
C、液晶数码
D、气体放电式
参考答案：C
The school is no longer what it was 20 years ago, _______it was so poorly equipped.
A．when
B．which
C．since
D．where
注塑车间影响产品质量的过程参数有哪些？
