对酶进行化学修饰时，应考虑哪些因素？

限制性图谱

限制性物理图谱

Shutdown price（or point，or rule） 停业价格（或停业点、停业原则）

The vowel is produced without (or with little) restriction during its production and is always voiced.（）

简述酶作为生物催化剂与一般化学催化剂的共性及其特性？

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

Why are many people on restricted or reduced diets?

Some cable services offer 1.5 megabyte or higher access for as ______ as $40 a month, but there are some restrictions regarding service.

未经（）批准，运输危险化学品的车辆不得进入危险化学品运输车辆限制通行的区域。

运输危险化学品的车辆（）不得进入危险化学品运输车辆限制通行的区域。