焊嘴头被堵塞时，可将嘴头与平板摩擦，也可用通针清理，以消除堵塞物。()
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The word "rightly" (Para. 5) can be best replaced by _____.
A. justly
B. understandably
C. evidently
D. appropriately
The word "malleable" (Line 6, Paragraph 5) is closest in meaning to
A. miserable.
B. adaptable.
C. vulnerable.
D. active.
露天爆破按一次爆破炸药量和装药方式的不同可分为：深孔爆破、浅孔爆破、药室爆破、裸露药包爆破以及临近边坡控制爆破等。()
The seminars held by PON are intended to______.
A. put management and labor back to negotiation table again
B. help management and labor get less from each other
C. help management and labor reevaluate their respective roles
D. put more responsibilities to both management and labor
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