图纸上尺寸单位，除标高和总平面图外，其他均以( )为单位。
A．cm(厘米)
B．m(米)
C．mm(毫米)
D．dm(分米)
参考答案：C
You can't use the machine today because some parts_____ this week. [ ]
A. are replaced
B. are being replaced
C. have replaced
D. are replacing
体内主要的抗凝物是
A．因子ⅫB．因子ⅢC．Ca2+D．抗凝血酶Ⅲ
