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利多卡因表面麻醉成人一次限量为

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A．expressB．instructC．revealD．brief

A. express
B. instruct
C. reveal
D. brief

扩散指数的计算公式为()。

Their newly_______toys will be free from material defects and offer you a three-year product guarantee from the date of purchase.

A. introduced
B. introduction
C. introduce
D. introducing

同时供应中耳和外耳血液的动脉是