I dont like to buy things with a label of "the latest technology", since they are usually______ to problems.
A. likely
B. possible
C. potential
D. prone
Which of the following sentences expresses a certainty？
A. In England, traffic must keep to the left.
B. All men must die.
C. You must be hungry after your long walk.
D. You must be joking.
试述理解“津血同源”和“汗血同源”的机理及其临床意义。
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