如果整车的金属材料都用高强钢,汽车的整体质量就能达到最佳,防撞击能力就越强。
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潜艇级别用钢材的屈服强度也要达到()MPa。
A. 800~900
B. 900~1000
C. 1000~1100
D. 1100~1200
Should I at a red light, a green light, or a yellow light?
A. speed up
B. turn off
C. slow down
D. put on
Most students before a big test.
A. stress
B. are stressed
C. are stressing
D. will stress
When are we supposed to our project proposals?
A. admit
B. commit
C. subject
D. submit