A.硅酸盐
B.二氧化硅
C.硫酸盐
D.碱性氧化物
答案:A
Which of the following can be transported by pipeline()
A.coal
B.gas
C.fuel
D.electricity
腹痛一般不伴休克的是()
A.十二指肠溃疡穿孔
B.急性心肌梗死
C.胃溃疡出血
D.泌尿系结石
E.中毒性菌痢