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【单选题】
下列有关配制海藻酸钠溶液的叙述中,不准确的是 [     ]
A.
加热使海藻酸钠溶化是操作中最重要的一环
B.
海藻酸钠的浓度关系到固定化细胞的质量
C.
海藻酸钠可在水中迅速溶解,无须再加热
D.
海藻酸钠的浓度过低,形成的凝胶珠内包埋的细胞过少
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参考答案:
举一反三
【简答题】在空间直角坐标系中,在Ox轴上的点P 1 的坐标特点为(    ),在Oy轴上的点P 2 的坐标特点为(    ),在Oz轴上的点P 3 的坐标特点为(    ),在xOy平面上的点P 4 的坐标特点为(    ),在yOz平面上的点P 5 的坐标特点为(    ),在xOz平面上的点P 6 的坐标特点为(    )。
【简答题】在空间直角坐标系中,点P(-1,2,3)关于坐标平面xOy对称点的坐标是______.
【简答题】在平面直角坐标系中,点P(—1,—2)关于原点对称点的坐标是_______.
【简答题】Remembering your dreams will require some efforts on your part. But what your dreams can offer and tell you about yourself will be well worth it. Here are some tips to help recall your dreams: 1. Befo...
【简答题】在平面直角坐标系中,点P(-2,3)关于x轴对称的点P 1 的坐标是______.
【单选题】According to Cartwright, in what way do dreams function as a built-in therapist?
A.
Dreams regulate mood and help people deal with emotional problems.
B.
Dreams lay new emotional experience on top of old memories.
C.
Dreams help people forget old experience, relatives and friends.
D.
Dreams figure out emotional related images and experience.
【单选题】What can people recall about their dreams?
A.
All people don’t recall their dreams.
B.
None of the people can recall their dreams.
C.
People usually can recall the whole dream before awakening.
D.
People sometimes can recall all the dreams they have during the night.
【简答题】What is the cause of dreams in which you are being chased?
【单选题】-- Our dreams won’t come true __________ we know what our dreams are.
A.
after
B.
unless
C.
while
D.
since
【简答题】在空间直角坐标系中,点P(1,2,3)关于坐标平面xOy对称点P′的坐标为(    )。
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