连杆螺栓工作条件繁重，要求较高的强度和较好的塑韧性，应选用______钢。
查看答案
According to the authors understanding, what is A1 Gores view on global warming？
A. It is a reality both people and politicians are unaware of.
B. It is a phenomenon that causes us many inconveniences.
C. It is a problem that can be solved once it is recognized.
D. It is an area we actually have little knowledge about.
对要求表面硬、耐磨性好、心部强韧性好的重载齿轮，则通常选用______钢经______热处理制造。
对要求表面高硬度、耐磨性好而心部强韧性好的重载齿轮，通常选用______钢经______热处理制造。
According to theauthor,_________.
A. war is the only way to solve internatioual disputes
B. war will be less dangerous because of the improvement of weapons
C. it is impossible for man to live without war
D. war must be abolished if man wants to survive
微信支付 
支付宝支付