【单选题】Some experts warn that it will do harm to our health if we drink _________water only.
【简答题】图解法适用于含有 个变量的线性规划问题。
【单选题】An increasing number of people enjoy sun-bathing, but experts warn that too much ________of the body to strong sunlight is harmful.
【单选题】The experts study on the problem of erosion can______.
A.
warn people whose homes are in danger
B.
provide an effective way to slow it down
C.
help to its eventual solution
D.
lead to its eventual solution
【单选题】放电管的直流点火电压,应不低于回路工作电压的( ):
【单选题】放电管的直流点火电压,应不低于回路工作电压的()倍。
【简答题】图解法适用于含有 个变量的线性规划问题。
【简答题】不定积分在几何上通常表示__________________.
【单选题】Experts warn that global warming will cause dramatic climate changes, including more ________ floods, heat waves and droughts. [ ]