叶轮给粉机有何优缺点?
参考答案:
叶轮给粉机的优点是供粉较均匀,不易发生煤粉自流,并可以防止一次风冲入粉仓;缺点是结构较复杂,易被煤粉中的木屑等杂物堵塞,电耗也较大。
Peter told us the work would be finished by next month, ________ personally I doubt very much.
A.which
B.when
C.that
D.it
引起喉痉挛的可能病因是()
A.血钾过低
B.血钠过高
C.血钙过低
D.血糖过高
E.血锌过低