家庭常用节能灯的电功率约为[ ]
A 0.1W
B 1W
C 10W
D 100W
C
蛛网膜下隙出血的病因是什么?
There is no doubt _____ he means to help, but in fact he just gets in the way.
A．that
B．whether
C．what
D．if
