AIS评分中，当分值为3时，表明损伤的严重度是（）
A.轻度
B.中度
C.较重
D.严重
E.危重
参考答案：C
正常胎心基线变异范围是（）。
A.<5次／分
B.5～10次／分
C.5～25次／分
D.10～15次／分
E.15～25次／分
The equation relates the values of two linked currencies, where R is the value in dollars of one currency and S is the value in dollars of the other currency. Which of the following equations can be used to convert dollar values from the R currency to the S currency ？（）
A.A
B.B
C.C
D.D
E.E
relates the values of two linked currencies, where R is the value in dollars of one currency and S is the value in dollars of the other currency. Which of the following equations can be used to convert dollar values from the R currency to the S currency ？（）