HDL能转运到肝脏进行分解代谢的是（）。
A.胆固醇脂
B.LPA.
C.游离胆固醇
D.乳糜微粒
E.甘油三酯
参考答案：C
It is the educational system, rather than the teachers, _______ is to blame for the students’ heavy burden nowadays.
A．who
B．this
C．that
D．whom
粘合制袋机停车时，应该等加热温度降到（）℃以下再关闭循环水。
A.50
B.100
C.150
D.200
