健康成年人最大心率的计算方法为()。
A.240~年龄
B.220~年龄
C.200~年龄
D.180~年龄
E.150~年龄
参考答案:B
The school rule states that no child shall be,unless________by an adult,allowed out of the school during the day.
A.was accompanied
B.accompanying
C.accompanied
D.being accompanied
已知某岩石单轴抗压强度60MPa,其极限莫尔应力圆圆心于σ-τ坐标为()MPa。
A、30,30
B、60,0
C、30,0
D、0,30