管程设计压力大于壳程设计压力的换热器，图样上应对换热管与管板连接接头的试验方法和试验压力提出详细要求。
参考答案：对
It is said that the number of doctors invited to the meeting _____100, but a number of them _____ absent for different reasons.
A．is; were
B．is; was
C．are; were
D．are; was
