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【单选题】
心动期中,从主动脉瓣关闭到下一次主动脉瓣开放的时间相当于A.
等容收缩期
B.
心室射血期
C.
心室舒张期
D.
心室射血期+等容收缩期
E.
心室舒张期+等容收缩期
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反馈参考答案：
举一反三
【单选题】He tried to ______ his involvement in this scheme, but he finally gave in and confessed.
A.
refuse
B.
decline
C.
reject
D.
deny
【单选题】He tried to__________his involvement in this robbery，but he finally confessed．
A.
decline
B.
reject
C.
refuse
D.
deny
【单选题】揭示基因化学本质的表述是 [ ]
A.
基因是遗传物质的功能单位
B.
基因是有遗传效应的DNA片段
C.
基因是蕴含遗传信息的核苷酸序列
D.
基因在染色体上呈线性排列
【单选题】In the story told by Dave Barber, ______.
A.
he was finally saved by his grandmother
B.
he was finally saved by his nine-year-old son
C.
he would have been drowned if his grandmother had not lifted him
D.
he would have been taken away by his grandmother if his son had not dragged him down
【单选题】下列有关基因的叙述，错误的是 [ ]
A.
原核生物的基因和真核生物的基因化学本质不同，结构不同
B.
病毒可在基因工程中作运载体
C.
利用基因工程可生产胰岛素
D.
基因工程中用人工合成法获得的真核生物的目的基因无内含子
【单选题】人们常用泡菜坛(图1)腌制泡菜。腌制过程中,由于乳酸菌的发酵作用产生乳酸,使泡菜具有酸性风味;有些杂菌却会导致泡菜亚硝酸盐增加,对人体可能有不利影响。酸性环境有利于抑制杂菌繁殖、分解亚硝酸盐。研究小组对泡菜中乳酸菌和亚硝酸盐进行检测,结果如图2。下列叙述,正确的是
A.
泡菜坛应加水密封，主要目的是形成无光条件
B.
前3天亚硝酸盐含量增加导致乳酸菌数量上升
C.
发酵第3天乳酸菌较多，此时的泡菜适于食用
D.
亚硝酸盐含量先增加后减少与乳酸菌繁殖有关
【单选题】He tried to ______ his involvement in this scheme, but he finally gave in and confessed.
A.
reject
B.
deny
C.
refuse
D.
decline
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