The abbreviations of “before meals” is
A: m.n.
B: p.c
C: a.c.
D: h.s
A: m.n.
B: p.c
C: a.c.
D: h.s
举一反三
- The abbreviations of “ before meals” is:
- 设矩阵Am´s, Bp´n, 若A+B有意义，必有（ ） A: m=p或s=n B: m=n或s=p C: m=p且s=n D: m=n且s=p
- 原油的主要组成元素是___? A: C H O N S B: C H O N P C: C H N S P D: C N O S P
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