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【判断题】
水泥终凝是指水泥加水拌合后获得规定强度的时间点。()A.
正确
B.
错误
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举一反三
【单选题】下列《断魂枪》的语句中,属于沙子龙肖像描写的是
A.
利落，短瘦，硬棒，两眼明得像霜夜的大星
B.
个子大，一脸横肉，努着对大黑眼珠，看着四围
C.
大刀靠了身，眼珠努出多高，脸上绷紧，胸脯子鼓出，像两块老桦木根子
D.
脑门亮，眼睛亮——眼眶虽深，眼珠可黑得像两口小井，深深的闪着黑光
【简答题】并联补偿在工厂供电系统中的装设位置，有-------------------补偿三种方式。
【简答题】第11章测验题.ppt
【简答题】并联补偿在工厂供电系统中的装设位置，有______补偿、低压成组补偿补偿和就地分散补偿三种。
【多选题】How do mitogens stimulate cell division by promoting entry into S phase?
A.
Most mitogens are secreted signal proteins that bind to cell-surface receptors. When activated by mitogen binding, these receptors initiate various intracellular signaling pathways that stimulate cell division.
B.
These signaling pathways act mainly by releasing the molecular brakes that block the transition from the G1 phase of the cell cycle into S phase.
C.
Most mitogens have been identified and characterized by their effects on cells in culture. One of the first mitogens identified in this way was platelet-derived growth factor, or PDGF, the effects of which are typical of many others discovered since. When blood clots form (in a wound, for example), blood platelets incorporated in the clots are stimulated to release PDGF.
D.
PDGF then binds to receptor tyrosine kinases in surviving cells at the wound site, stimulating these cells to proliferate and help heal the wound. In a similar way, if part of the liver is lost through surgery or acute injury, a mitogen called hepatocyte growth factor helps stimulate the surviving liver cells to proliferate.
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