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【多选题】
汽车、拖拉机的齿轮要求表面高耐磨性,心部有足够的塑韧性,用( )A.
20钢渗碳淬火后低温回火
B.
20CrMnTi渗碳淬火后低温回火
C.
40Cr淬火后高温回火
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【单选题】(2018· 湖南师大附中调研 ) 为测量植物细胞膜的透性,以红甜菜根 ( 液泡中含有花青素 ) 进行下列实验:将不同切片放在不同温度的蒸馏水中处理 1 min 取出,再分别放在清水中浸泡 1 h 而获得不同的 切片浸出物溶液,通过测量这些溶液的吸光度计算浸出物溶液的花青素含量,结果如图所示。对这个实验方案评价的叙述,正确的是 ( ) A .缺乏对照组实验 B .缺乏对等量原则的描述 C .所选择...
A.
a
B.
b
C.
c
D.
d
【单选题】在PBMC悬液中加入直径为3μm的羟基铁粉颗粒，置37℃中充分反应后，上层液中的主要细胞是
A.
B细胞
B.
T细胞
C.
单核细胞
D.
淋巴细胞
E.
PBMC中混入的杂质细胞
【单选题】在 PBMC 悬液中加入直径为3μm 的羟基铁颗粒,置37℃,充分反应后,沉于有磁铁的管底的 是
A.
淋巴细胞
B.
单核细胞
C.
B细胞
D.
T细胞
E.
PBMC中混入的杂质细胞
【单选题】The key to our room was ( ) to a large plastic plate with the room number on it.
A.
attached
B.
connected
C.
joined
D.
related
【简答题】the key to our room was______________ to a large plastic bolck with teh room number on it.
【单选题】Speaker A: We can’t find the key to our room. Speaker B: ___________.
A.
You can close the window.
B.
You’d better go to the reception desk. You may ask her to repeat.
【简答题】The key to our room is attached to a large plastic block with the room number on it.
【简答题】The key to our room was _____系在 to a large plastic block with the room number on it. When leaving the hotel, a ____ 客人 was encouraged to turn in the key, either by handing it to an ____ or by dropping...
【简答题】一. 请将下列句子翻译成汉语: 1. The key to our room was attached to a large plastic block with the room number on it. 2. Because the key slot was narrow, the key had to be positioned carefully to fit into it. 3. I...
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