年长儿每日由碳水化合物所提供能量应占总需能量的（）
A.70%～75%
B.50%～60%
C.45%
D.30%
E.15%
参考答案：B
Everybody has ______ responsibility to save water, if future generations are to enjoy _____ similar standard of living to the one we enjoy now.
A．the; /
B．a; a
C．/; the
D．a; the
受压元件焊补后的热处理宜采用（）热处理。
A.分段
B.整体
C.局部
