gaokao 2019 Q7

gaokao · China · national-II-arts Not Maths

7. Let $\alpha , \beta$ be two planes. Then $\alpha / / \beta$ is a necessary and sufficient condition for
A. There are infinitely many lines in $\alpha$ parallel to $\beta$
B. There are two intersecting lines in $\alpha$ parallel to $\beta$
C. $\alpha , \beta$ are both parallel to the same line
D. $\alpha , \beta$ are both perpendicular to the same plane

Given non-zero vectors $\boldsymbol { a } , \boldsymbol { b }$ satisfying $| \boldsymbol { a } | = 2 | \boldsymbol { b } |$, and $( \boldsymbol { a } - \boldsymbol { b } ) \perp$

7. Let $\alpha , \beta$ be two planes. Then $\alpha / / \beta$ is a necessary and sufficient condition for\\
A. There are infinitely many lines in $\alpha$ parallel to $\beta$\\
B. There are two intersecting lines in $\alpha$ parallel to $\beta$\\
C. $\alpha , \beta$ are both parallel to the same line\\
D. $\alpha , \beta$ are both perpendicular to the same plane\\

Paper Questions

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