In the xy plane, is the point (4, -2) on the line l?
(1) Point (1, 1) is on line l.
(2) The equation x=2-y describes line l.
第1题
surf(x, 5*ones(size(x)), y)
A.z=y plane
B.a plane parallel to xy plane
C.a plane perpendicular to xy plane
D.y=5x plane
第2题
Why air must be pumped into the plane?
A.Because without air the plane can't fly.
B.Because the plane needs air for its fuel.
C.Because the passengers' lives depend on air.
D.Because the passengers have paid for it.
第3题
Don't smoke until the plane ______ off. ()
A.takes
B.took
C.has taken
D.had taken
第4题
第5题
Why did Ann want to scream? Because ______.
A.the plane didn' t leave the ground
B.she couldn' t make the plane stop
C.she couldn' t hear the wind
D.she couldn' t see the runway
第7题
Why air must be pumped into the plane?
A.Because without air the plane can't fly.
B.Because the plane needs air for its fuel.
C.Because the passengers' lives depend on air.
D.Because the passengers have paid for it.
第8题
A.agree with
B.agree to
C.fit for
D.match with
第9题
A.if
B.since
C.because
D.until
第10题
Don' t smoke until the plane ______ off.
A.takes
B.took
C.has taken
D.had taken
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