压机上检测振动位移的探头常用安装方法有哪些？
参考答案：
两种，一为机械测隙安装法，一为电气测隙安装法，常用电气测隙安装法。
—I can't see the words on the blackboard clearly.
—Why! Your eyes need _______, Perhaps you need _______ glasses. [ ]
A. to examine, wear
B. to examine, to wear
C. to be examined, to wear
D. examining, wearing
如图是实验室制取二氧化碳的装置图：
（1）写出图中指定仪器的名称①______②______．
（2）下列实验中可选用该装置的是______．
A．二氧化锰催化双氧水分解制氧气；
B．高锰酸钾受热分解制氧气；
C．木炭还原氧化铜．
