单项选择题

Our family（）not to exchange Christmas gifts this year.

A.has agreed
B.had agreed
C.have agreed
D.agrees

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单项选择题

A．垂体后叶加压素静脉滴注
B．立即输新鲜全血
C．应用各种止血药物
D．三腔管气囊压迫
E．去甲肾上腺素加入冷盐水口服

单项选择题

A．固有分辨率^1/2+准直器分辨率^1/2
B．固有分辨率+准直器分辨率
C．固有分辨率²+准直器分辨率²
D．固有分辨率×准直器分辨率
E．固有分辨率/准直器分辨率

单项选择题

A. Left wondering
B. Having left wondering
C. Leaving to wonder
D. Having left to wonder