A、Changes in configuration involve the rupture of covalent bonds.
B、Changes in configuration involve the rotation of one or more single bonds.
C、The Ramachandran plot illustrates the degree to which steric hindrance limits the permissible angles of the single bonds in the backbone of a peptide or protein.
D、Formation of an α-helix is stabilized by the hydrogen bonds between each peptide bond carboxyl oxygen and the N-H group of the next peptide bond.
E、In a β-sheet the R-group of adjacent residues point in opposite directions relative to the plane of the sheet.
A、myelitis
B、glionueroma
C、myelomeningocele
D、poliomyelitis
A、Because the quest for the hare would solve the hidden riddle inside the novel.
B、Because the location of the golden hare would become the h1dden information in his novel.
C、Because he did not want others to retrieve the treasure.
D、Because he wanted to reward his readers with something special.
A、Adjustment
B、Shipment
C、Transport
D、Packing
【填空题】Lesson 2 课后作业-Vocabulary Practice V Complete the following sentences by filling the blanks with the words or phrases given below. aileron rudder flaps yaw powerplant roll empennage landing gear 1._______are a type of high-lift device used to increase the lift of an aircraft wing at a given airspeed. 2. _______is a vertical airfoil pivoted from the horizontal stabilizer of an aircraft, for controlling movement around the vertical axis. 3. An ______ is a hinged flight control surface usually forming part of the trailing edge of each wing of a fixed-wing aircraft, which controls the movement of the aircraft around its longitudinal axis. 4. The undercarriage of an aircraft and may be used for either takeoff or landing is known as_______ 5. The tail or tail assembly, also known as_________, is a structure at the rear of an aircraft that provides stability during flight. 6. Rotation around the vertical axis is called ______ . 7. Rotation around the front-to-back axis is called______ . 8. The ______ of an aircraft may be an engine and propeller combination or a jet engine.
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