患丙种球蛋白低下血症时最易感染下列哪类病原体
A．细菌
B．病毒
C．真菌
D．原虫
E．以上均易感
参考答案：A
about this computer program, a huge amount of time and energy .
A．Should I know; be saved
B．If I had known; can be saved
C．Had I known; would have been saved
D．Did I know; was saved
小明将塑料尺在衣服上摩擦几下，然后把尺靠近碎纸屑，纸屑被吸起，这种现象叫做_______ 。如果知道图中所示A球带正电，由现象可知，B球一定带________ 电
