皮皮学，免费搜题
登录
搜题
【多选题】
平面ABCD中，点A坐标为（0，1，1），点B坐标为（1，2，1），点C坐标为（-1，0，-1）．若向量 a =（-2，y，z），且 a 为平面ABC的法向量，则y z =（ ）A.
2
B.
0
C.
1
D.
-1
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】Have you ever passed a border crossing between two countries? If so, you were probably questioned by a customs inspector. A customs inspector often asks travelers what they are bringing into the count...
A.
in return for money and a free trip
B.
to help an old friend
C.
in hopes of selling them
D.
to get rich quick
【简答题】Have you ever thought of such questions as “Why do I have to study math?”or “I am not interested in history at all. My dream is to be an actor. Should I give history up?” Maybe you are right. After yo...
【简答题】Try not to pay an ______ visit to others' homes because it is impolite. (announce)
【简答题】阅读理解 Exploit your parking space An unused parking space or garage can make money. If you live near a city center or an airport, you could make anything up to £200 or £300 a week. Put an advertisement ...
【单选题】投资组合能降低风险，如果投资组合包括证券市场全部的股票，则投资人（）
A.
不承担市场风险，也不承担公司特有风险
B.
不承担公司特有风险，但承担市场风险
C.
不承担市场风险，但承担公司特有风险
D.
既承担市场风险，也承担公司特有风险
【单选题】Have you ever passed a border crossing between two countries? If so, you were probably questioned by a customs inspector. A customs inspector often asks travelers what they are bringing into the count...
A.
a border crossing
B.
an airport
C.
either A or B
D.
a post office
【单选题】下列关于网络营销的内容正确的是
A.
网上消费者行为分析、 网上市场调查、网上防伪认证
B.
网上招聘、网络营销策略制定、网络布线
C.
网上渠道策略、网络营销运营与管理、网上价格营销策略
D.
网上产品和服务策略、网上经营者行为分析、网络促销策略
相关题目：