[单选题] 变压器负载损耗反映的是( )。
A. 铁芯损耗
B. 绕组损耗和漏磁损耗
C. 只有绕组损耗
D. 只有漏磁损耗

急性广泛前壁心肌梗死（V₁～V₅导联ST段抬高伴异常Q波）主要是由于（）

A--Connect the mains lead, using the battery pack when using your camcorder outdoors.
B--Slide OPEN/EJECT button in the direction of the arrow and open the lid.
C--Push the center of the cassette back to insert the cassette.
D--Insert the cassette straight as far as possible into the cassette compartment with the window facing up
E--Close the cassette compartment by pressing PUSH on the cassette compartment.
F--After the cassette compartment goes down completely, close the lid until it licks.
G--Open the lens cap.
H--Set the POWER switch to CAMERA while pressing the small green button.
I--Press OPEN to open the LCD panel. The picture appears on the screen.
J--Press START/STOP. Your camcorder starts recording. To stop recording, press START/STOP again.

For many years, scientists couldn’t figure out how atoms and molecules combined to make living things. Plants, fish, dinosaurs, and people are made of atoms and molecules, but they are put together in a more complicated way than the molecules in the primitive ocean. What’s more, living things have energy and can reproduce, while the chemicals on the Earth 4 billion years ago were lifeless.
After years of study, scientists figured out that living things, including human bodies, are basically made of amino acids, nucleotide bases, lipids and water. How could such complicated molecules have been formed and have started to interact in the primitive soup Scientists were stumped.
Then, in 1953, two scientists named Harold Urey and Stanley L. Miller did a very simple experiment to find out what had happened on the primitive Earth. They set up some tubes and bottles in a closed loop, and put in some of the same gases that were present in the atmosphere
A. 4 billion years ago.
B. After seven days.
C. Many years ago.
D. In 1953.