Diesel engines are started by supplying into the cylinders in the appropriate sequence for the required direction. A.cooling water B.compressing air C.compressed air D.cylinder oil

中国大学MOOC: You can attach a very large document without breaking it in several parts or compressing it.

At the bottom dead center (BDC), the piston moves back up, compressing the trapped fuel-air mixture in the cylinder with both intake and exhaust valves closed．

Treating bruises, muscle strains, swelling, and animal bites usually involves icing and ______the injuries, as well as taking over-the-counter anti-inflammatory or pain medication. A: compressed B: compressing C: attended D: adminstering

‌Treating bruises, muscle strains, swelling, and animal bites usually involves icing and ______the injuries, as well as taking over-the-counter anti-inflammatory or pain medication.‍ A: compressed B: compressing C: attended D: adminstering

For any piston ring to operate smoothly without scuffing, the ring must be_______. A: of a material harder than the cylinder line B: properly lubricated C: prevented from compressing D: prevented from rotating during engine operation

Whichtwowordsareclosestinmeaning?<br/><b>cycle</b><b>，</b><b>hawk</b><b>，</b><b>convey</b><b>，</b><b>extort</b><b>，</b><b>peddle</b><b>，</b><b>summon</b>

设A{a,b}，则P(A)×A = (   )。 A: A B: P（A） C: {<Φ,a>,<Φ,b>,<{a},a>,<{a},b>,<{b},a>,<{b},b>,<A,a>,<A,b>} D: {<a,,Φ,>,<b,,Φ,>,<a,{a}>,<b,{a}>,<a,{b}>,<b,{b}>,<a,A>,<b,A>}

以下哪段代码可以将A,B的值互换（） A: A=A^B; B=A^B;A=A^B B: A= A^B;A=A^B;B=A^B C: B= A^B; B=A^B; A=A^B D: B=A^B; A= A^B; A= A^B

若集合A={a，b}，B={ a，b，{ a，b }}，则（）。 A: A⊆B，且A∈B B: A∈B，且B⊆A C: A⊈B，且A∉B D: A∉B，且A⊈B