水泥过细时，水泥的后期强度下降（），水泥凝结硬化，早期强高，单位水泥的成本升高。
A.快
B.慢
C.不变
参考答案：A
After staying in hospital for long，the patient was advised to go to the seaside to ________ his health．[ ]
A．take up
B．pick up
C．carry up
D．make up
使用不含肾上腺素的利多卡因，成人单次用量为（）
A.200mg
B.400mg
C.250mg
D.300mg
E.350mg
