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【多选题】
下列说法正确的是( )。A.
一般鉴别试验通常鉴别是某一类药物
B.
紫外可见光谱法中吸光度的最佳值为0.2～1.0
C.
性状项下一般记载了药品的外观、臭、味、溶解度、物理常数等
D.
薄层色谱法用于药物的鉴别依据是主斑点的位置和颜色
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举一反三
【单选题】The park was created to____________some of the forests upstate.
A.
prevent
B.
progress
C.
prevail
D.
preserve
【单选题】When the United States Congress created Yellowstone National Park in 1872, the goal was to set aside a place where Americans could enjoy the beauty of nature for years to come. Now, 142 years later , ...
A.
Which U. S. National Park Has the Most Visitors?
B.
Should National Parks Allow the Use of Cell Phones?
C.
What Did Yellowstone Do to Enrich Park Visitors' Experience?
D.
Can Technology Transform. the Way People Experience Nature?
【单选题】以下说法,哪个是正确的( )。
A.
电子电路在放大信号时，如不能保证无失真地放大，则放大毫无意义。
B.
放大倍数是衡量电路放大能力的重要指标，其值是输入量比上输出量。
C.
对于电压放大电路来说，输入电阻越小越好，输出电阻越大越好。
D.
由于通频带内电路放大能力较高且平坦，因此电路的通频带越宽越好。
E.
多个放大电路相互连接时，输入和输出电阻均会直接或间接影响整个电路的放大能力。
【单选题】The park was created to ( ) some of the forests upstate.
A.
preserve
B.
protected
C.
preservation
【多选题】下列表达属于加载不适当情感的有( )。
A.
宗教即迷信神的存在
B.
错误即是一种有价值的学习机会
C.
张三慷慨大方
D.
化妆是成年人最起码的礼貌
E.
王五真的对他人很感兴趣
【简答题】Ernest Miller Hemingway was born on July 21, 1899 in Oak Park, Illinois. In the nearly sixty two years of his life that followed he forged a literary reputation unsurpassed in the twentieth century. I...
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