开工过程中可向烷基化装置脱烷烃塔塔顶集油槽垫料的部位有()。
A.提馏塔底泵
B.冷却回流泵
C.脱氢反应进料泵
D.提馏塔进料泵
参考答案:A, C
下列选项中,哪一项不是疱疹样阿弗他溃疡的临床特点()
A.溃疡个数多
B.溃疡直径一般<2mm
C.口腔黏膜可见成簇小水疱
D.溃疡深度较浅
E.愈合后不留瘢痕
As the little boy ______ milk now, he doesn’t want to eat any other food.
A.used to drink
B.used to drinking
C.is used to drink
D.is used to drinking