15.煤的最大粒度(),每个子样采样量不少于4kg。
参考答案:〈100mm
胃溃疡存在的主要特点是()
A.胃酸降低
B.贫血
C.胃酸分泌升高
D.两者均无
E.胃酸分泌升高和贫血
—Are you going to have a football game on Saturday ________ on Sunday?
—On Sunday.
A.and
B.or
C.but
D.so