急性腹泻病程正确的是
A.1周
B.<2周
C.2~3周
D.3~4周
E.4周以下
参考答案:B
离子色谱法测定废气中氯化氢时,配制的试剂不能贮存在塑料瓶内。
Dust storms most often occur in areas where the ground has little vegetation to protect of the wind.
A.from the effects
B.it the effects
C.it from the effects
D.the effects from it