题干
.
Some companies have introduced flexible working time with less emphasis on pressure ____.
Some companies have introduced flexible working time with less emphasis on pressure ____.
A：than more on efficiency
B：and more efficiency
C：and more on efficiency
D：than efficiency
答案(点此获取答案解析）
C
Ti+2MgCl2 ，若要制得96 g 钛，计算至少需要镁的质量。