A-A+
When were pulse rates taken？A．After every exer
问题详情
When were pulse rates taken？
A．After every exercise period.
B．Every time the ratio of active riding was increased.
C．Every day.
D．After each step-test.
参考答案
正确答案：D
解析：由文中可知，在每次阶梯测试后都要测量脉搏。
考点：
