gaokao 2004 Q13

gaokao · China · shanghai-science Not Maths Monotonicity, symmetry, or parity analysis of a trigonometric function

13. Among the following propositions about lines $l$, $m$ and planes $\alpha$, $\beta$, the true proposition is
A. If $l \subset \beta$ and $\alpha \perp \beta$, then $l \perp \alpha$.
B. If $l \perp \beta$ and $\alpha \parallel \beta$, then $l \perp \alpha$.
C. If $l \perp \beta$ and $\alpha \perp \beta$, then $l \parallel \alpha$.
D. If $\alpha \cap \beta = m$ and $l \parallel m$, then $l \parallel \alpha$.

13. Among the following propositions about lines $l$, $m$ and planes $\alpha$, $\beta$, the true proposition is\\
A. If $l \subset \beta$ and $\alpha \perp \beta$, then $l \perp \alpha$.\\
B. If $l \perp \beta$ and $\alpha \parallel \beta$, then $l \perp \alpha$.\\
C. If $l \perp \beta$ and $\alpha \perp \beta$, then $l \parallel \alpha$.\\
D. If $\alpha \cap \beta = m$ and $l \parallel m$, then $l \parallel \alpha$.

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