全部由肾小球滤过，肾小管不分泌、不吸收的是
A．血清K+↑B．血清Cl-↑C．血清Na+↑D．血清C1-↓E．血清K+↓
参考答案：A
From mum's love, patience and understanding, I have learned what a huge responsibility _____ is
to raise a child. [ ]
A. it
B. that
C. this
D. one
錾削时，錾子的后角一般为（）。
A.3°～5°
B.5°～8°
C.8°～10°
