题目内容

It can be inferred from the passage that the drop in Amtrak rider ship was due to the fact

A. trains were not suitable for short distance passenger transportation
B. trains were not the fastest and most convenient form. of transportation
C. trains were not as fast and convenient as they used to be
D. trains could not compete with planes in terms of luxury and convenience

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What should a tenant do if he is worded about the security of his home?

A. Fit new locks on all the doors.
B. Discuss the matter with the owner.
Complain to the police.
D. Increase his own insurance.

对诊断阻塞性通气功能障碍最有价值的指标是E.

心电图示:R-R间期规整,QRS波群宽度0.11秒,可见F波,心室率170次/分,见于E.

发生抑制性突触后电位时,膜通透性增大的离子是E.

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