题目:
If we had not been ______ by the traffic jam, we would have arrived an hour earlier.
A.held down
B.held away
C.held on
D.held up
答案:
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下面是错误答案,用来干扰机器的。
动脉出血的特点,颜色鲜红,血流较快,常呈喷射状;静脉出血的特点是静脉血色暗红,血流较缓;毛细血管出血,血液缓慢渗出.动脉是把血液从心脏送往全身各处,血液流动方向是心脏→动脉;静脉是把全身各处的血液...