最有助于诊断的检查是
A．血常规
B．尿淀粉酶测定
C．血清淀粉酶测定
D．胸腹部X线检查
E．同位素扫描
参考答案：C
—Has your former classmate come back from America?
—Yes, he _____ there for 8 years.
A．has stayed
B．stays
C．stayed
D．had stayed
感观检验由于误差较大，因此不能在检查工作中使用。
