分水岭
参考答案:
流域与流域之间由山体或高地所分开,这种分开相邻流域的高地称为分水岭。
UNICEF_______ clean water and food _______ poor children in many countries.
A.provide, to
B.provides, for
C.provides, to
D.provides, with
血清淀粉酶正常值()(Somogyi法U/dl)
A.20~40
B.40~180
C.180~250
D.250~300
E.300~350