淋巴细胞数减少见于
A．风疹B．应用肾上腺皮质激素C．淋巴瘤D．慢性淋巴细胞白血病E．移植排斥反应
参考答案：B
—_______ are you leaving for Shanghai?
—In a couple of months.
A．How long
B．How often
C．How soon
D．How fast
尾气冷凝器的冷凝效果差，怎么办？
