（）既是商务谈判中的对手也是合作伙伴。
参考答案：供应商
- _______ I take my umbrella with me?
- _______ better to do so. The weather is changeable.
A．Must; You'd
B．Shall, It's
C．Need; You'd
D．Would; It's
换药室要求空气中的细菌总数（）
A.≤10cfu/m3
B.≤100cfu/m3
C.≤200cfu/m3
D.≤500cfu/m3
E.≥500cfu/m3
