对发病较晚的急性胰腺炎诊断有帮助的是
A.血清脂肪酶B.血尿素氮C.血清淀粉酶D.血清正铁白蛋白E.血清钙
参考答案:A
影响炉渣流动性的因素很多,但主要是和温度及炉渣的()。
Most electronic devices of this kind, ( ) manufactured for export, are tightly packed.
A.that are
B.as are
C.which is
D.it is