下列何种嗜血杆菌主要引起原发性化脓性疾病（）
A.埃及嗜血杆菌
B.流感嗜血杆菌
C.溶血嗜血杆菌
D.副流感嗜血杆菌
E.杜克嗜血杆菌
参考答案：B
预乙级机电产品国际招标机构的专职招标从业人员应不少于（）名。
A．10
B．20
C．30
D．50
After the new equipment was introduced，they produced________machines this year as the
year before.[ ]
A．as twice many
B．as many twice
C．twice as many
D．twice many as
