AT-401在线色谱仪程序表2中组分C2H6量程是()。
参考答案:0-2%
复数(3+4i)i(其中i为虚数单位)在复平面上对应的点位于( )
A.第一象限
B.第二象限
C.第三象限
D.第四象限
I don't mind _ the window. It is hot in the room. [ ]
A. to open
B. opened
C. opening
D. to opening