磨削导热性差的材料或容易发热变形的工件时，中短波轮粒度应细一些。

下列选项中不受刑事追究的是( )。

A．提供了虚假的证人证言

B．由于害怕报复，提供了没有签名的证人证言

C．提供了次要的犯罪事实，故意隐匿了被告人的严重罪行

D．有意提供了使某无辜者受到法律追究的证人证言

森林中设置隔离带的主要原因是[ ]

A．隔绝空气

B．隔离可燃物

C．铺设公路

D．美化环境

硫化亚铁和钝化剂反应生成的产物不易溶于水。

Throughout the 19th century and into the 20th, citizens of the United States maintained a bias against big cities. Most lived on farms and in small towns and believed cities to be centres of (1) , crime, poverty and moral (2) Their distrust was caused, (3) , by a national ideology that (4) farming the greatest occupation and rural living (5) to urban living. This attitude (6) even as the number of urban dwellers increased and cities became an essential (7) of the national landscape. Gradually, economic reality overcame ideology. Thousands (8) the precarious (不稳定的) life on the farm for more secure and better paying jobs in the city. But when these people (9) from the countryside, they carried their fears and suspicions with them. These new urbanities, already convinced that cities were (10) with great problems, eagerly (11) the progressive reforms that promised to bring order out of the (12) of the city.

One of many reforms came (13) the area of public utilities. Water and sewerage systems were usually operated by (14) governments, but the gas and electric networks were privately owned. Reformers feared that the privately owned utility companies would (15) exorbitant (过渡的) rates for these essential services and (16) them only to people who could afford them. Some city and state governments responded by (17) the utility companies, but a number of cities began to supply these services themselves. (18) of these reforms argued that public ownership and regulation would (19) widespread access to these utilities and guarantee a (20) price.

16（）

A.distribute

B.deliver

C.transfer

D.transport

某个人独资企业投资人在申请企业设立登记时明确以其家庭共有财产作为个人出资，为维持其他家庭成员的基本生活条件，该投资人应以其个人财产对企业债务承担无限责任。( )