根据能量守恒定律,泵对液体提供的能量应等于液体消耗于()的能量,
A.管路
B.阀门
C.叶轮
D.泵内
参考答案:A
Nine thousand guests took part in the outdoor ceremony, ______ that impressed so many people at the White House.
A.that
B.this
C.it
D.one
血常规检查白细胞计数高于正常值,可能有()。
A.细菌感染
B.病毒感染
C.麻疹
D.流行性腮腺炎
E.疟疾