胸导管阻塞（）
A．血清K+↑
B．血清Cl-↑
C．血清Na+↑
D．血清C1-↓
E．血清K+↓
参考答案：D
56. It is impossible for so workers to do so work in a single day.
A．few; much
B．few; many
C．little; much
D．little; many
紧边
