粒细胞减少症是指中性粒细胞计数()。
A.<15×109/L
B.<10×109/L
C.<4×109/L
D.<1.5×109/L
E.<0.5×109/L
参考答案:D
— Hi, Tom. Is your sister as active as you?
— No, she’s a quiet girl. She is ________.
A. less outgoing than I B. not so calm as I C. more active than I
A.当温度降低到接近绝对零度时某些材料的电阻会突然减小为零
B.电流的方向就是导体的电子定向移动的方向
C.电阻率越大的导体,它的电阻一定越大
D.形成电流的条件是只要导体内有自由移动的电荷