____ is to be done is ______ to carry it out smoothly since the decision has been made．

A．What; how

B．Where; how

C．When; what

D．Where; what

禁用高压蒸汽灭菌的物品是()。

A．金属类

B．化纤织物

C．搪瓷类

D．棉织品

E．细菌培养基