She is quite capable and can be depended on in an __________ .
A. affair
B. accident
C. incident
D. emergency
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下列蛋白质哪个有四级结构？()
A. 肌红蛋白
B. 胰岛素
C. 胰蛋白酶
D. 血红蛋白
下列哪种情况下血红蛋白的氧合曲线向右移？()
A. pH值升高
B. pH值降低
C. 解离成单个亚基
D. COB分压升高
钨极氩弧焊时，易爆物品距离焊接场所不得小于()。
A. 1m
B. 10m
C. 50m
D. 5m
__________ such a good chance he planned to learn more
A. giving
B. Having given
C. Having been given
D. To be given
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