皮皮学，免费搜题
登录
搜题
【单选题】
在反相色谱法中,若以甲醇水为流动相,增加甲醇的比例时,组分的保留因子k与保留时间t R 的变化为( )。A.
k与t R 增大
B.
k与t R 减小
C.
k与t R 不变
D.
k增大, t R 减小
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】QRS电轴一般采用心电轴与____导联正侧段所构成的夹角来表示平均心电轴的偏移方向,并规定I导联正(左)侧端为____o(填入阿拉伯数字),右(负)侧端为____o(填入阿拉伯数字),。
【多选题】The NLS_SORT parameter sets the default sort method for which of the following operations？（）
A.
WHERE clause
B.
ORDER BY clause
C.
BETWEEN clause
D.
NLSSORT function
E.
NLS_SORT function
【单选题】Which of the following statements is true regarding simple sort techniques?
A.
exchange sort if frequently referred to as a bubble sort.
B.
exchange sort is the least expensive.
C.
if random data are in an array that is to be sorted ,an insertion sort will give then best performance for large elements with small sort items.
D.
both insertion sort an selection sort require O(n) moves.
【单选题】Which of the following statements is true regarding simple sort techniques?
A.
Exchange sort is frequently referred to as a bubble sort.
B.
Exchange sort is the least expensive.
C.
If random data are in an array that is to be sorted, an Insertion Sort will give the best performance for large elements with small sort items.
D.
Both Insertion Sort and Selection Sort require O(n)moves.
相关题目：