少尿是指24小时尿量少于__________mL,无尿则是指24小时尿液少于__________mL。
参考答案:400mL|100mL
My sister and I look different _____ we are twins. [ ]
A. as
B. though
C. because
D. and
带传动常用的传动比i一般不大于()。
A.2
B.5
C.7
D.10