正常人消化道内铁吸收效率最高的部位是
A．胃B．十二指肠及空肠上部C．空肠D．回肠E．回盲部
参考答案：B
He the job well, but he so careless.
A．had done; had been
B．could do; was
C．could have done; was
D．hadn’t done; had been
玻璃钢管道装卸应轻抬轻放，防止硬物发生（），严禁（）。
