皮皮学，免费搜题
登录
搜题
【单选题】
已知直线经过(x1,y1)点,斜率为k(k≠0),则直线方程为( )。A.
y-y1=k(x-x1)
B.
y=5kx+3
C.
y =9k(x-x1)
D.
y=4x+b
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
【单选题】The old man bought a ticket ______.
A.
after he got on the train
B.
before he got on the train
C.
as soon as the conductor told him to buy one
【简答题】光衰减器主要有两种类型:( ),( )。
【单选题】-- When did you_____? -- I’ve_____ _for two months.
A.
got married; been married
B.
be marred; been married
C.
get married; got married
D.
get marred; marred
【简答题】某火电厂有两台机组共同向负荷供电,其耗量特性和约束条件分别为: F 1 =0.02P 1 2 +2P 1 +10t/h , 20MW≤P 1 ≤60MW ; F 2 =0.03P 2 2 +3P 2 +16t/h , 20MW≤P 2 ≤60MW ; 求当有功功率负荷为 80MW 时的经济分配 方案, 并计算最优分配方案比平均分配方案每小时节约多少煤炭 。
【单选题】He soon ______from failure, and promised to work harder than before.
A.
got across
B.
got through
C.
got over
D.
got away
【单选题】They ________ with each other for two years before they got married. [ ]
A.
had fallen in love
B.
got in love
C.
had been in love
D.
fell in love
相关题目：