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【多选题】
What are the functions of cilia?
A.
Many microtubules in cells are stabilized through their association with other proteins and therefore do not show dynamic instability. Cells use such stable microtubules as stiff supports in the construction of a variety of polarized structures, including motile cilia and flagella.
B.
Cilia are hairlike structures about 0.25 μm in diameter, covered by plasma membrane, that extend from the surface of many kinds of eukaryotic cells. Each cilium contains a core of stable microtubules, arranged in a bundle, that grow from a cytoplasmic basal body, which serves as an organizing center.
C.
Motile cilia beat in a whiplike fashion, either to move fluid over the surface of a cell or to propel single cells through a fluid. Some protozoa, for example, use cilia to collect food particles, and others use them for locomotion. On the epithelial cells lining the human respiratory tract , huge numbers of beating cilia (more than a billion per square centimeter) sweep layers of mucus containing trapped dust particles and dead cells up toward the throat, to be swallowed and eventually eliminated from the body.
D.
Similarly, beating cilia on the cells of the oviduct wall create a current that helps to carry eggs away from the ovary. Each cilium acts as a small oar, moving in a repeated cycle that generates the movement of fluid over the cell surface.
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【多选题】下列各项中,应填入资产负债表“货币资金”项目的有(   ) 
A.
库存现金
B.
银行存款
C.
其他货币资金
D.
交易性金融资产
【单选题】紫外分光光度法定量分析符合朗伯比尔定律,即吸光度与( )成正比
A.
光的波长
B.
溶液的浓度
C.
溶液的厚度
D.
溶液的厚度和浓度的乘积
【单选题】对拉延件材料为 DC03 t0.8 ,拉延模凸模与下模座分开做时,凸模的材料是( ),下模座的材料是( )。 A MoCr 铸铁 HT300 B HT300 MoCr 铸铁 C Cr12MoV HT300 D MoCr 铸铁 ZG310-570
A.
B.
C.
D.
D
【单选题】触头的终压力能够()
A.
灭弧
B.
减小接触电阻
C.
防振
D.
有足够的机械强度
【单选题】牌号为T12A的材料是指平均含碳量为( )的碳素工具钢
A.
1.2%
B.
12%
C.
0.12%
D.
2、2%
【简答题】光学仪器公司潜望镜独获厚利 1981 午7月29日,是英国王子查尔斯和戴安娜小姐举行婚礼的日子,英国首都伦敦全市轰动起来,成千上万的人涌向街头,为了亲暏这个耗资10亿英镑的“本世纪最豪华的婚礼”。当天不少人一清早就来到街头,占领有利地形,有的甚至在前一天挽上露宿街头。从白金汉宫到举行结婚仪式的圣保罗教堂,长约三千米的街道上,竟聚集近百万人,人们都在静静地等待着。上午10时,盛典即将开始,街道两傍已...
【单选题】牌号为T12A的材料是指平均含碳量为( )的碳素具钢
A.
0.012
B.
0.12
C.
0.0012
D.
0.022000000000000002
【单选题】电子签名最主要的应用方法是
A.
RSA签名
B.
DSS签名
C.
Hash签名
D.
DES签名
【单选题】下列各项中,应在资产负债表中货币资金项目列示的是( )
A.
银行本票存款
B.
银行承兑汇票
C.
商业承兑汇票
D.
以公允价值计量且其变动计入当期损益的金融资产
【单选题】对于采用最大泡压法测定乙醇水溶液的表面张力实验,以下说法正确的是( )
A.
实验时,出泡的快慢,对实验结果无影响
B.
实验时,出泡越快越好,可以加快实验进程
C.
实验时,出泡速度控制到 5-6 个 / 分钟,出泡缓慢均匀比较合适
D.
可以按照乙醇水溶液浓度从小到大,控制出泡速度逐渐加快
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